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28f540f4 RM |
1 | /* Copyright (C) 1991, 1995 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
18 | ||
19 | #include <ansidecl.h> | |
20 | #include <errno.h> | |
21 | #include <math.h> | |
22 | ||
23 | /* Deal with an infinite or NaN result. | |
24 | If ERROR is ERANGE, result is +Inf; | |
25 | if ERROR is - ERANGE, result is -Inf; | |
26 | otherwise result is NaN. | |
27 | This will set `errno' to either ERANGE or EDOM, | |
28 | and may return an infinity or NaN, or may do something else. */ | |
29 | double | |
30 | DEFUN(__infnan, (error), int error) | |
31 | { | |
32 | switch (error) | |
33 | { | |
34 | case ERANGE: | |
35 | errno = ERANGE; | |
36 | return HUGE_VAL; | |
37 | ||
38 | case - ERANGE: | |
39 | errno = ERANGE; | |
40 | return - HUGE_VAL; | |
41 | ||
42 | default: | |
43 | errno = EDOM; | |
44 | return 0.0; | |
45 | } | |
46 | } | |
47 | ||
48 | weak_alias (__infnan, infnan) |